[Jherbie53]

It all depends on you how you want your transmission setup. It you want a two speed then build or order one. If you want to focus on another part of the robot without spending a lot of time on the drive train the go with the kit ones. Other factors are the type of drive train your using and the game that year. Some years you get a good kit transmission, while other years you can build a better one. It really varies from year to year, and team to team.